Gill, Paul, John Horgan, and Paige Deckert. "Bombing Alone: Tracing the Motivations and Antecedent Behaviors of Lone-Actor Terrorists." Journal of Forensic Sciences 59, no. 2 (2014): 425-35.

Altier, Mary Beth, Christian Thoroughgood, and John Horgan. "Turning Away From Terrorism: Lessons from Psychology, Sociology, and Criminology." Journal of Peace Research 51, no. 5 (2014): 647-61.

Horgan, John, and Kurt Braddock. "Rehabilitating the Terrorists?: Challenges in Assessing the Effectiveness of Deradicalization Programs." Terrorism and Political Violence 22, no. 2 (2010): 267-91.

Horgan, John. "Individual Disengagement: A Psychological Analysis." In Leaving Terrorism Behind, 17-29. Oxon and New York: Routledge, 2009.

Bjørgo, Tore, and John Horgan. "Introduction." In Leaving Terrorism Behind: Individual and Collective Disengagement, 1-14. Oxon and New York: Routledge, 2009.

Horgan, John. Walking Away from Terrorism: Accounts of Disengagement from Radical and Extremist Movements. Oxon and New York: Routledge, 2009.

Horgan, John. The Psychology of Terrorism. Oxon: Routledge, 2005.

Horgan, John, and Max Taylor. "Playing the ?Green Card? ? Financing the Provisional IRA: Part 1." Terrorism and Political Violence 11, no. 2 (1999): 30-31.